FAQ
1073: Handle case where an entirely empty log is left during NN crash
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Key: HDFS-2093
URL: https://issues.apache.org/jira/browse/HDFS-2093
Project: Hadoop HDFS
Issue Type: Sub-task
Reporter: Todd Lipcon
Assignee: Todd Lipcon




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  • Todd Lipcon (JIRA) at Jun 24, 2011 at 11:35 pm
    [ https://issues.apache.org/jira/browse/HDFS-2093?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

    Todd Lipcon resolved HDFS-2093.
    -------------------------------

    Resolution: Fixed
    Hadoop Flags: [Reviewed]

    Committed to branch, thanks for review
    1073: Handle case where an entirely empty log is left during NN crash
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    Key: HDFS-2093
    URL: https://issues.apache.org/jira/browse/HDFS-2093
    Project: Hadoop HDFS
    Issue Type: Sub-task
    Components: name-node
    Affects Versions: Edit log branch (HDFS-1073)
    Reporter: Todd Lipcon
    Assignee: Todd Lipcon
    Fix For: Edit log branch (HDFS-1073)

    Attachments: hdfs-2093.txt, hdfs-2093.txt, hdfs-2093.txt, hdfs-2093.txt


    In fault-testing the HDFS-1073 branch, I saw the following situation:
    - NN has two storage directories, but one is in failed state
    - NN starts to roll edits logs to edits_inprogress_5160285
    - NN then crashes
    - on restart, it detects the truncated log, but since it has 0 txns, it finalizes it to the nonsense log name edits_5160285-5160284.
    - It then starts logs again at edits_inprogress_5160285.
    - After this point, no checkpoints or future NN startups succeed since there are two logs starting with the same txid
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